Gear-cutting machine.



C. A. PARSONS, A. 0. CARNEGIE & S. S. BOOK.

GEAR CUTTING MACHINE.

APPLICATION msn my 1. ms.

- a "UNITED STATES meme OFF CHARLES ,ALGEBNON ransons AND ALFRED QUINTIN CARNEGIE. enmEwcAs'rLE- UPONJIYNE, AND STANLEY SMITH COOK, or WALLSEND, ENGLAND; sun can- NEGIEMAND'SAJZD COOK assmnons TO SAID PARSONS.

GEAR-CUTTING MACHINE.

Specification of Letters Patent.

atented Dec. 19, I916.

Original application filed February 27, 1914. Serial No, 821,500. Divided and this application filed May 1,

1916. Serial No. 94,844.

To (/71 whom it 'H'Hlj/ con ern lie it known that \\'e (n.utmcs Ami-:axox Pansoxs, K. 13.. of lleaton Works. Newcastle-upoll-Tyne, Nortluunla rlaml. Anion-1n Qt'lN'rix CARNEGIE, residing at lleaton 'orks, Newcastle-upon-'lync, in the county of Xorthumberland. and S'rxxu-zr Simir CUOIQdQSidlDg at 'lurbinia \Vorks, Wallseiul-on Iyne, in the county of .\'orthl|mberland, England.subjects of the King otiGreat liritain and Ireland. have invented certain new and useful Improvements in (tear-(ut- Ling Machines, of which the following is a specification.

This invention relates to the means for cuttin the teeth in gea r wheels Hlltil in are described in application Serial Number 821,500. filed February '27, 1914.

Referring to the accompanying drawings:---Figure 1 is a part sectional elevation of a gear cutting machine cndalying the present invention. Fig. 2 is a part sectional plan of Fig. 1.

In carrying the invention into effect according to the present construction the driving or indexing wheel which may take the form of a ring a is placed in an inclined position and is constrained to rotate about its axis B Ii by any suitabie means such for example as the projection 71 upon thebed \vhicl co-acts with a groove m in the ring elei'ucnt a, the element a being further constrained by the dogs 1-. It will be seen that the resultof this construction is that the elemerit (6 rotates about its axis B which is non-coincident with the axis A A about which the work table (I rotates.

Upon the e'iement n. indexing worm teeth h areformed and are engaged by the worm The teeth in this construction are formed upon the upper face. of the ring 4!. and engage bevel teeth f carried upon the work table. The diameter of the pitch circle of the teeth 1* is slightly difl'erent from the pitch eirele ofthe teeth f, the pitch circle t f cjbeing preferably greater than the pitch circio' of f:

It ivill benoticed that as the teeth f and a engage over a considerable are the motion imparted by the teeth to .theteeth 1 depends upon the average accuracy of a munbcr of teeth instead of depending upon the m-cm-m'y of one or two teeth.

It will be understood that although the element a has been described as a ring, it may in some cases take the form of a more or less solid wheel element. hen formed as a ring, however, it is desirable that the teeth 7' and r: should be arranged to engage at a point near the engagement of the parentgears and h.

it will be seen that owing to the rotary motion imparted by the element a to the table 1/. being at a slightly 'difi'erent angular .\])(((I from that of the element itself a suit- .able shift of phase of the work table in relation to the driven member h of the parent or indexing gear in successive revolutions of the work table is obtained.

Having now described our inventiomwhat we claim as new and desire to secure by Letters iatent is:- g

1. In combination in a gear cutting ma chine. a work table, a ring element, means acting to constrain saidelement to rotate about an axis inclined to the axis of rotation of said table. teeth upon said ring, driving means engaging said teeth, teeth upon said table, teeth upon said ring co-acting with said tabletceth to transmit rotary motion to the table, said (o-acting teeth having slightly different pitch circle diameters.

In combination in a gear cutting machine. a work table, a ring element, means acting to constrain said element to rotate about an axis non-eoinchient with the axis of rotation of said table. teeth upon said ring. driving means engaging said teeth. bevel. teeth upon said table, teeth upon said ring co-acting with said bevel teeth to transmit rotary motion to the teeth, said (Jo-acting teeth having slightly different pitch circle diameters.

In combination a work table, a circu'iar element adapted to rotate about an axis noncoincident with the axis of rotation of said table, means to rotate said element, a ring of teeth upon one face of said element, bevel teeth upon said table, said ring of teeth and said bevel teeth co-acting to rotate said table at a different rate from said element.

4. In combination a work carrying member. a circular element, means acting to constrain said element to rotate about an axis inclined to the axis of rotation of said member, said means comprising a stationary ing worm eng inclined Surface, a. projection upon saidsurface, said projection co ziotinguwith a igroove in, one face of-sa'id element, 11'" ring 0 teeth upon the other face of said element, teeth upon the periphery of said element e driv- 'ng said teeth, bevel teeth upon said m'em er, said ring of teeth and said bevel teeth co-acting to rotate said member at a difierentrate from said element.

In testimony whereof, we have aflixed our si gnetures.

CHARLES ALGERNON PARSONS. ALFRED QUINTIN CARNEGIE. STANLEY SMITH 000K.

norm of tilt: patent may be obtained for live cents each, by addressing the "Commissioner of Patents, WaahlngtonJ) 0. 

